Journal article
Advances in carboxylate collectors adsorption on monazite surface: Part 1-Assessment of the hydroxylation and carbonation of surface lanthanide ions
Times Cited: 0

Authors/Editors

Research Areas
Currently no objects available

APPLIED SURFACE SCIENCE
Publication Details
Author list: Geneyton A, Filippov LO, Renard A, Mallet M, Menad NE
Publisher: Elsevier
Place: AMSTERDAM
Publication year: 2019
Volume number: 485
Start page: 283
End page: 292
Number of pages: 10
ISSN: 0169-4332
View additional information: View in Web of Science™

Abstract
The adsorption of carboxylate collectors is largely assumed to be affected by the monazite surface speciation. In order to provide key information for the understanding of this phenomenon, we propose in this study a thermodynamic model for the equilibrium of monazite-(La) crystal in an H2O-CO2 system. This model allows access to the speciation information of the dissolved lattice species. Based on this model, we identify potential chemical reactions that may affect, under certain conditions, lanthanide ions on monazite surface. Since these surface ions have vacant coordination sites, they may react with water molecules and media species to restore their coordination shells. Therefore, it has been suggested that surface lanthanide ions undergo hydroxylation and carbonation reactions under alkaline conditions.X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy were used to analyse synthetic monazite-(La) samples treated in deionised water or sodium carbonate solutions. The spectroscopy results suggest that surface lanthanide ions do tend to hydroxylate under alkaline conditions. Furthermore, under the tested conditions, no significant monazite surface carbonation was observed. These results indicate that surface lanthanide ions have limited affinity for dissolved carbonate species, contrary to what is suggested by the thermodynamic model for free lanthanide ions in the bulk.

Keywords
Currently no objects available

Documents
Currently no objects available

Last updated on 2019-04-12 at 00:01